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Item Factors affecting productivity on tea estates in Sri Lanka -1- the impact of each field on annual crop production(Tea Research Institute. Thalawakele, 1975) De Silva, R.L.; Saravanapavan, T.V.Item Tea in North-East India(Tea Research Institute. Thalawakele, 1972) De Silva, R.L.; Wettasinghe, D.T.; Calnaido, D.